Thrust transmitting apparatus for jaw crushers



Feb. 23, 1965 THRUST K. GAU LDIE 3,170,644

TRANSMITTING APPARATUS FOR JAW CRUSHERS Filed Sept. 7, 1962 INVENTOR.

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ATTORN EY United States Patent O 3,170,644 THRUSTTRANSMITTING APPARATUS FOR JAW CRUSHERS Kenneth Gauldie, Toronto, Ontario, Canada, assignor to Hydraulic Crushers Limited, New Liskeard, Ontario,

Canada Filed Sept. 7, 1962, Ser. No. 222,147 .1 Claim. (Cl. 241-264) This invention relates to thrust transmitting apparatus for use in hydraulically-operated jaw crushers of the type comprising a power driven reciprocating plunger and a dependent source, accurate and effective control of such pressure is possible.

It is an object of this invention to provide a thrust 7 transmitting apparatus for hydraulically-operated jaw crushers wherein thrust is transmitted by liquid pressure, in which such pressure is developed from an-independent source, and in which accurate and effective control of such liquid pressure is possible.

The present invention contemplates, in a-hydraulicallyoperated jaw crusher having a jaw, a reciprocating ram and a hydraulic system for operating the jaw through the ram, the provision of means for transmitting thrust from the ram to the jaw comprising a thrust bearing interposed between said ram and said jaw and having mating surfaces, and means for delivering between said mating surfaces fluid under pressure from a source independent of said jaw-operating hydraulic system.

This source may be a small positive pump delivering at low but more-or-less constant rate to the thrust bearing and separating its mating surfaces by a thin film of fluid escaping between them. In such case, the pressure developed by the pump and transmitting force hydraulically to the jaw would be more-or-less proportional to the thrust transmitted by the ram.

The continually changing pressure developed by the pump may be applied to another bearing in the thrust system. Should the effective diameter of the latter bearing be less than that of the former, the fluid pressure exerted between its mating surfaces would be insuflicient to force them apart, in which case part of the thrust would be transmitted by direct mechanical contact between these surfaces. One of these surfaces may be of porous material through which fluid pressure would be propagated and which would also transmit thrust by direct contact between the mating surfaces.

Alternatively, the oil may be delivered to the bearing from a source of more-or-less constant pressure through a throttling resistance to limit the rate of its flow.

The single figure of the drawing illustrates, in sectional side elevation, one embodiment of the invention.

Referring to the drawing, 10 is the moving jaw of a hydraulically-operated jaw crusher having a ram 11 mounted for reciprocation in a ram cylinder 12. The ram is driven in conventional manner by means of fluid 3,170,544 Patented Feb. 23,1965

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2 j pressure in the ram cylinder as delivered by the hydraulic system of the crusher.

Force is transmitted from the ram to the jaw by means of a thrust link 13 having one end engaged by the ram and its-opposite end surface 14 of part-spherical configuration (concave as shown) mating with a complementary surface 15 of part-spherical form (convex as shown) of a bearing 16 carried by the jaw 10.

Fluid under pressure is delivered from any suitable source independently of the hydraulic system of the crusher through a connection 17 to a passage 18 in the thrust link and thence through a duct 19 to recess 20 formed in bearing 16, whence it escapes radially as a thin film of oil or other fluid flowing between the mating surfaces 14 and 15. This film maintains these surfaces out of contact with each other.

It will be appreciated that the pressure at any instant of the oil or fluid delivered to the bearing will, of course,

, depend on and bear a definite relation to the force being transmitted at that instant from the ram to the jaw. Should the fluid delivery pump be of the reciprocating kind, it is preferable that its active stroke should coincide with the forward stroke of the jaw.

As illustrated in the drawing, the thrust from the ram may be transmitted to the thrust link 13 through another bearing comprising a part-spherical (concave as shown) surface 21 on the adjacent end of the thrust link and an element 22 of porous material seated in the end of the ram and having a part-spherical surface 23 (convex as shown) mating with surface 21. Duct 19 communicates with a recess 24 in the bearing element 22. The material of bearing element may be any suitable sintered porous hearing metal.

The instantaneous pressure in the duct 19 is transmitted to and through the porous bearing element 22 to the concave mating surface 21.

As shown in the drawing, the diameter of the mating surfaces 21 and 23 of the bearing is less than that of the mating surfaces 14 and 15 of the other bearing on the jaw. The same thrust is, however, transmitted through both bearings whence it follows that the corresponding pressure intensity under which fluid escapes between the mating surfaces 14 and 15 is insufficient to separate the mating surfaces 21 and 23. The latter surfaces remain, therefore, in contact, fluid in appreciable volume does not escape from that hearing, and a proportion of the thrust is transmitted by direct contact between its mating surfaces.

The fluid delivered through connection 17 may be from a source of constant pressure and the rate of its flow may be limited by a throttling resistance, such as a small orifice. In such case, if the pressure were high enough, leakage between the mating surfaces would be continuous but at varying rate. If, however, the pressure were insufficient to carry the whole thrust the mating surfaces would come into contact if the excessive thrust continued for long enough for the fluid film to be squeezed out, and part of the thrust would be transmitted by direct mechanical pressure between the mating surfaces.

While the bearing surfaces have been shown as concave-convex, that is, part-spherical, they may of course be of other configuration, such as cylindrical. Any fluid under pressure such as water or air, may be used as the thrust-transmitting agent.

I claim;

The combinationwith a hydraulically-operated jaw crusher having a jaw, a reciprocating ram, and a hy draulic system for'operating the jaw through the ram, of-

ofeachv said concavehearing surface being smaller than said convex bearing surface with which it is in contact,

eaehfof-said convexbear'ing surfaces having a v recess axially arrangedthereirnsaid thrust linkih'avin'gtan axial duct com municating 'with each of said recesses and a passage communicating with said duct, and a' conduit independent of said hydraulic system connected to said passa'gefor supplying fluid under pressure to said surfaces through said passage, duct, and recesses.

References iCitetl in the file of this patent UNITED "STATES PATENTS FOREIGN, PATENTS -Gauldie May'30, 1961 v 

